题目内容

Doctors in the US wanted to know__________

A. the motivation offlaxseed study
B. the study on ginseng displays its good promise
C. the tots’responsibilities led them to carry out these two studies
D. ginseng is as good to cancer patients as flaxseed
E. the methods and results of the study on flaxseed
F. a different opinion Oil the use of flaxseed

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A.workB.startC.changeD.balance

A. work
B. start
C. change
D. balance

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According to Hartley, which of the following is NOT influenced by sexual conflict？

A. The evolution of the offsprings behavior.
B. The look of the offsprings faces.
C. The number of eggs produced by one offspring at a time.
D. The offsprings body size.

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根据材料回答下列各题：第一篇 Genetic Engineering Genetic ehgineering began when the DNA molecule(分子)，the most basic unit of life，was first described in l953 by James Watson and Francis Crick．An understanding of DNA led to the altering of normal cell reproduction．Experiments with altering human cells began in l970．In one of the first experiments，patients were injected with a virus that would produce a life—saving enzyme，but their bodies would not accept it．In l980 patients with a rare but fatal blood disease were injected with a purifled gene that was cloned through DNA technology．Another failure． Genetic engineering got a legal boost(激励)in l980．The U．S．Supreme Court said that a patent could be granted on a genetically engineered“oil—eating”bacterium(细菌)．This bacterium would help clean up oil spills．The ruling encouraged companies to invent new life forms，and three important medical products were quickly developed． Human interferon(干扰素)一a possible solution to some cancers and viral disease．A newly engineered bacterium produced human interferon as a by—product．This new product reduced the cost of interferon． Human growth hormone—for children whose bodies do not grow to normal height．An expensive growth hormone(荷尔蒙)was previously produced from human cadavers，but by changing the genetic make—up of the single—cell bacterium E．coli，and affordable growth hormone could be produced． Human insulin(胰岛素)一for the treatment of diabetes．People with diabetes used to rely on a beef-or pork—based product until l982．Now insulin can be manufactured by genetically altered bacteria． Advances in genetic engineering have continued，though they constantly must be weighted against the safety of procedures．There is clearly much more to discover． This passage is mainly about________．

A. the effects of altering cells
B. the human growth hormone
C. insulin resistance
D. U．S．Supreme Court rulings

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American restaurants serve large portions because Americans____________

A. have big bellies
B. value quantity
C. want enough nutrition
D. are mostly rich

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